Dr. Joy Reidenberg is an expert in comparative anatomy, but also quite relatable to preteens! Here, she lectures on echolocation by likening it to "farting with the face!" She explains with film, actual whale voice recordings, diagrams, and verbal explanation, how their sounds are made. You will definitely want to find a way to fit this gem of a lesson into your lessons on whales, marine biology, echolocation, or animal behavior. Your class will have a whale of a time!